mersenneforum.org  

Go Back   mersenneforum.org > Great Internet Mersenne Prime Search > Software

Reply
 
Thread Tools
Old 2021-12-02, 23:10   #67
mathwiz
 
Mar 2019

3·97 Posts
Default

The thread title says "small exponents only". Apologies if I've missed this elsewhere in the thread but what is considered "small" if we want to beta test 30.8 with some P-1 work?
mathwiz is offline   Reply With Quote
Old 2021-12-02, 23:13   #68
lycorn
 
lycorn's Avatar
 
"GIMFS"
Sep 2002
Oeiras, Portugal

2×19×41 Posts
Default

Quote:
Originally Posted by techn1ciaN View Post
IIUC, recent versions of Windows (10 and 11 are the ones I have relevant experience with) will start opportunistically caching system files if there is not much RAM being "actively" used. This is not associated with any particular program, so wouldn't show up in Task Manager.
That makes a whole lot of sense, and it´s probably happening in my system (I´m using Win10).

Quote:
Originally Posted by techn1ciaN View Post
Windows's caching creeps in during stage 1, but the necessary space is always vacated when stage 2 starts.
Well, that would be the sensible thing to do, no doubt about it. Yet I am not really sure that it´s actually working that way. When stage 2 starts, the TM quickly indicates 96% to 97% (!) of mem usage, even though P95 is claiming to use no more than the 12 GB I had allocated, and the rest of the tasks appearing in the TM window are using at most 1 GB all together. There still appears to be something behind the scenes stealing resources (RAM, in this case). The memory usage tends to later stabilize at around 93-94% but there is still a "missing" amount of memory of approximately 2 GB.
lycorn is offline   Reply With Quote
Old 2021-12-02, 23:44   #69
Uncwilly
6809 > 6502
 
Uncwilly's Avatar
 
"""""""""""""""""""
Aug 2003
101×103 Posts

2×13×409 Posts
Default

Quote:
Originally Posted by mathwiz View Post
The thread title says "small exponents only". Apologies if I've missed this elsewhere in the thread but what is considered "small" if we want to beta test 30.8 with some P-1 work?
Try numbers below 100M. This is specifically useful for those working below the DC milestone of 58M and even more so for those trying to find factors for exponents below 20M.
Quote:
Originally Posted by Prime95 View Post
Should you wish to try 30.8, same warnings as before. Links are below.
  • P-1 stage 2 is untested on 100M+ exponents. I am not sure the code can accurately gauge when the new code is faster than the old code.

Last fiddled with by Uncwilly on 2021-12-02 at 23:46
Uncwilly is offline   Reply With Quote
Old 2021-12-02, 23:54   #70
lisanderke
 
"Lisander Viaene"
Oct 2020
Belgium

109 Posts
Default

14923 I received 2888 GHzDs P-1 credit for this workload while it took me probably less than an hr to complete, perhaps credit given should be recalculated after a full release of 30.8 or higher versions!


Mind you, B2 was a whopping ~1,142,499 times B1!

Quote:
Sending result to server: UID: lisander/30.8b2, M14923 completed P-1, B1=100000000, B2=114249978542700, Wi4: EB22----

PrimeNet success code with additional info:
CPU credit is 2888.2833 GHz-days.

Last fiddled with by lisanderke on 2021-12-02 at 23:59
lisanderke is offline   Reply With Quote
Old 2021-12-03, 00:15   #71
techn1ciaN
 
techn1ciaN's Avatar
 
Oct 2021
U. S. / Maine

9216 Posts
Default

Quote:
Originally Posted by lycorn View Post
Yet I am not really sure that it´s actually working that way. When stage 2 starts, the TM quickly indicates 96% to 97% (!) of mem usage, even though P95 is claiming to use no more than the 12 GB I had allocated, and the rest of the tasks appearing in the TM window are using at most 1 GB all together. There still appears to be something behind the scenes stealing resources (RAM, in this case). The memory usage tends to later stabilize at around 93-94% but there is still a "missing" amount of memory of approximately 2 GB.
Windows does not tend to give up the spare space it parks unless you make it. Going back to my laptop, we know that I can give Prime95 13 GB of RAM (and possibly more) without problems, but Task Manager still reports "90%" system RAM usage during stage 2 even if I allocate just 9 or 10 GB. Windows will only clear out just enough of its cache to meet foreground programs' RAM requests, and usually not more.

You might try starting something else that you know uses at least a couple GB of RAM (e.g., a web browser) while Prime95 is in stage 2 and then checking Task Manager. You should find that the usage of the remaining 4 GB in your system becomes more "visible."
techn1ciaN is offline   Reply With Quote
Old 2021-12-03, 04:52   #72
petrw1
1976 Toyota Corona years forever!
 
petrw1's Avatar
 
"Wayne"
Nov 2006
Saskatchewan, Canada

3·37·47 Posts
Default

Quote:
Originally Posted by Prime95 View Post
[*]AVX-512 is untested -- likely to fail (perhaps silently). Pre-AVX is untested but might work. Recommend using only AVX and FMA FFTs.
Yup .... silently.
Per Att. #1.
Right after this Prime95 just went away....no other message.

Per Att. #2
This was on my i7-7820x

How do I force it to use AVX/FMA FFTs?
Attached Thumbnails
Click image for larger version

Name:	Boom.jpg
Views:	65
Size:	372.0 KB
ID:	26174   Click image for larger version

Name:	My CPU.png
Views:	64
Size:	5.7 KB
ID:	26175  
petrw1 is offline   Reply With Quote
Old 2021-12-03, 05:07   #73
axn
 
axn's Avatar
 
Jun 2003

2·2,693 Posts
Default

From undoc.txt
Code:
The program supports many different code paths for PRP/LL testing depending on
the CPU type.  It also has a few different factoring code paths.  You can
force the program to choose a specific code path by setting the proper
combination of these settings in local.txt:
	CpuSupportsRDTSC=0 or 1
	CpuSupportsCMOV=0 or 1
	CpuSupportsPrefetch=0 or 1
	CpuSupportsSSE=0 or 1
	CpuSupportsSSE2=0 or 1
	CpuSupports3DNow=0 or 1
	CpuSupportsAVX=0 or 1
	CpuSupportsFMA3=0 or 1
	CpuSupportsFMA4=0 or 1
	CpuSupportsAVX2=0 or 1
	CpuSupportsAVX512F=0 or 1
Just setting the last option to 0 should cause it to fallback to next best thing (i.e. FMA)
axn is offline   Reply With Quote
Old 2021-12-03, 05:10   #74
axn
 
axn's Avatar
 
Jun 2003

10101000010102 Posts
Default

Quote:
Originally Posted by Prime95 View Post
I suspect restarting build 2 will multithread just fine (until it doesn't).
This is repeatable. Multiple restarts with build 2 all yielded same behavior - top shows consistently at 200% instead of the expected high 500%
axn is offline   Reply With Quote
Old 2021-12-03, 05:25   #75
petrw1
1976 Toyota Corona years forever!
 
petrw1's Avatar
 
"Wayne"
Nov 2006
Saskatchewan, Canada

521710 Posts
Default

Quote:
Originally Posted by axn View Post
From undoc.txt
Code:
The program supports many different code paths for PRP/LL testing depending on
the CPU type.  It also has a few different factoring code paths.  You can
force the program to choose a specific code path by setting the proper
combination of these settings in local.txt:
	
	CpuSupportsAVX512F=0 or 1
Just setting the last option to 0 should cause it to fallback to next best thing (i.e. FMA)
petrw1 is offline   Reply With Quote
Old 2021-12-03, 05:42   #76
Prime95
P90 years forever!
 
Prime95's Avatar
 
Aug 2002
Yeehaw, FL

11111000010002 Posts
Default

Quote:
Originally Posted by axn View Post
This is repeatable. Multiple restarts with build 2 all yielded same behavior - top shows consistently at 200% instead of the expected high 500%
Can you send the usual files: worktodo.txt, prime.txt, local.txt, save file.

Thanks.
Prime95 is online now   Reply With Quote
Old 2021-12-03, 06:18   #77
axn
 
axn's Avatar
 
Jun 2003

150A16 Posts
Default

Quote:
Originally Posted by Prime95 View Post
Can you send the usual files: worktodo.txt, prime.txt, local.txt, save file.

Thanks.
https://www.mediafire.com/file/cm4ds...files.zip/file

Contains two save files. The save files were created by 30.7 with 8M/400M bounds. I am extending B2 to 2G with 30.8
axn is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Do not post your results here! kar_bon Prime Wiki 40 2022-04-03 19:05
what should I post ? science_man_88 science_man_88 24 2018-10-19 23:00
Where to post job ad? xilman Linux 2 2010-12-15 16:39
Moderated Post kar_bon Forum Feedback 3 2010-09-28 08:01
Something that I just had to post/buy dave_0273 Lounge 1 2005-02-27 18:36

All times are UTC. The time now is 07:52.


Wed Aug 10 07:52:37 UTC 2022 up 34 days, 2:39, 1 user, load averages: 1.15, 1.01, 1.00

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.

≠ ± ∓ ÷ × · − √ ‰ ⊗ ⊕ ⊖ ⊘ ⊙ ≤ ≥ ≦ ≧ ≨ ≩ ≺ ≻ ≼ ≽ ⊏ ⊐ ⊑ ⊒ ² ³ °
∠ ∟ ° ≅ ~ ‖ ⟂ ⫛
≡ ≜ ≈ ∝ ∞ ≪ ≫ ⌊⌋ ⌈⌉ ∘ ∏ ∐ ∑ ∧ ∨ ∩ ∪ ⨀ ⊕ ⊗ 𝖕 𝖖 𝖗 ⊲ ⊳
∅ ∖ ∁ ↦ ↣ ∩ ∪ ⊆ ⊂ ⊄ ⊊ ⊇ ⊃ ⊅ ⊋ ⊖ ∈ ∉ ∋ ∌ ℕ ℤ ℚ ℝ ℂ ℵ ℶ ℷ ℸ 𝓟
¬ ∨ ∧ ⊕ → ← ⇒ ⇐ ⇔ ∀ ∃ ∄ ∴ ∵ ⊤ ⊥ ⊢ ⊨ ⫤ ⊣ … ⋯ ⋮ ⋰ ⋱
∫ ∬ ∭ ∮ ∯ ∰ ∇ ∆ δ ∂ ℱ ℒ ℓ
𝛢𝛼 𝛣𝛽 𝛤𝛾 𝛥𝛿 𝛦𝜀𝜖 𝛧𝜁 𝛨𝜂 𝛩𝜃𝜗 𝛪𝜄 𝛫𝜅 𝛬𝜆 𝛭𝜇 𝛮𝜈 𝛯𝜉 𝛰𝜊 𝛱𝜋 𝛲𝜌 𝛴𝜎𝜍 𝛵𝜏 𝛶𝜐 𝛷𝜙𝜑 𝛸𝜒 𝛹𝜓 𝛺𝜔